Acquisitions (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Jan. 13, 2016	Dec. 31, 2015
Assets acquired:
Goodwill	$ 49,016		$ 39,247
AC2 Solutions, Inc.
Assets acquired:
Cash and cash equivalents		$ 78
Accounts receivable		100
Other current assets		63
Intangible assets		6,710
Goodwill		8,243
Total assets acquired		15,194
Liabilities assumed:
Accrued liabilities		136
Current portion of deferred revenue		74
Deferred tax liability		2,666
Total liabilities assumed		2,876
Purchase price of acquired assets and liabilities		$ 12,318